Customize icons based on audio route

[j-f1]

I’m not sure if it’s possible to detect this perfectly but a name-based check would be cool as well — showing e.g. the AirPods icon for when adjusting output volume for AirPods, and a generic headphone/speaker icon when adjusting output volume for the headphone jack. This way I could see at a glance which audio output is currently being used. This would also better match the iOS UI.